a88e87eee0
Xtensa hwloop_optimize segfaults when zero overhead loop is about to be inserted as the first instruction of the function. Insert zero overhead loop instruction into new basic block before the loop when basic block that precedes the loop is empty. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
50 lines
1.6 KiB
Diff
50 lines
1.6 KiB
Diff
From 7c11710230921246156aecc20eb4b6ccaeaaa473 Mon Sep 17 00:00:00 2001
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From: Max Filippov <jcmvbkbc@gmail.com>
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Date: Tue, 24 Sep 2019 04:15:17 -0700
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Subject: [PATCH] xtensa: fix PR target/91880
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Xtensa hwloop_optimize segfaults when zero overhead loop is about to be
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inserted as the first instruction of the function.
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Insert zero overhead loop instruction into new basic block before the
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loop when basic block that precedes the loop is empty.
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2019-09-26 Max Filippov <jcmvbkbc@gmail.com>
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gcc/
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* config/xtensa/xtensa.c (hwloop_optimize): Insert zero overhead
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loop instruction into new basic block before the loop when basic
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block that precedes the loop is empty.
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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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---
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Backported from: r276166
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gcc/config/xtensa/xtensa.c | 5 ++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c
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index ee5612441e25..2527468d57db 100644
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--- a/gcc/config/xtensa/xtensa.c
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+++ b/gcc/config/xtensa/xtensa.c
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@@ -4235,7 +4235,9 @@ hwloop_optimize (hwloop_info loop)
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seq = get_insns ();
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- if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1)
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+ entry_after = BB_END (entry_bb);
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+ if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1
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+ || !entry_after)
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{
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basic_block new_bb;
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edge e;
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@@ -4256,7 +4258,6 @@ hwloop_optimize (hwloop_info loop)
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}
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else
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{
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- entry_after = BB_END (entry_bb);
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while (DEBUG_INSN_P (entry_after)
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|| (NOTE_P (entry_after)
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&& NOTE_KIND (entry_after) != NOTE_INSN_BASIC_BLOCK))
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--
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2.11.0
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